Tighten up and refactor the tutorial WIP (#11316)

* Tighten up and refactor the tutorial

* Second half of the doc edits

* Apply suggestions from code review

Co-authored-by: Anthony <aj@ohess.org>

* Refactor conf options

* Less Python version maintenance

* Use ref for links

* Or just say next

* Use ref for link to hading

* Cleanup bullets

* Fix whitespace, thanks pre-commit

* Update docs/user/tutorial/index.rst

* Condense email shenanigans

* Apply suggestions from code review

Co-authored-by: Anthony <aj@ohess.org>

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Co-authored-by: Anthony <aj@ohess.org>